I have a 09 fxd handlebar mounted speedometer and was going to change out the housing and had a question. There is a company called 50s boy that made the housing for the 4 inch speedo but they are out of business now i guess and you can't get them anymore. Yankee enginuity makes the housing but their hole size is 3 3/8 and i called them and another company makes their stuff now and the guy had no clue how to help. My question is does anybody know if the internal part of the speedo under the face is the 3 3/8 inch or what size it is. i can't seem to find anybody that makes the speedo housing that is also part of the top clamp and the 3 3/8 hole is as big as yankee makes.